This is v2 of the firmware image for the ppc sam460ex machine type in
case you choose to add it with external git repo first. In case you
decide not to add it either as external git nor as a mirrored or
copied to QEMU repo then probably some wiki page should be updated to
point to a binary image for the machine to be usable but I'm not sure
how to do that. Please advise which of the above options should be
followed.